Two Way Intercom: 2.4GHz digital signal, built in microphone and speaker, you can talk to your baby from a distance without running back. Noise Detection: When the noise in the baby room is below 40db for more than 20 seconds, voice will be enabled and the monitor will cancel the slight background noise, until the noise exceeds 40db, the monitor will wake up and it will let you know exactly when your baby makes any sound.
